Blowpipe.



- PATENTED MAY 22., 1906.

. PICARD.

BLOWPIPE. 1

APPLICATION FILED JUNE 18. 1904.-

/M M/ H W, 3 a d e 's errar-ne No.. saints' Specification ci Letters Patent.

Patented May 22, i906.

Application he June 1s, igor. serai no. 212,303.

To tZZ whom it may concern:

Be it known that l, CHARLES PICARD, a citizen of the French Republic, and a resident ci aris, France, (whose postal oliice address is 282 Rue Samt-JacqueaParis, Franca) have invented lcertain new and useful Improve ments in Bloivpipes, of which the following is a speciiication.

This invention relates'to improvements in blowpipes in which acetylene or'any gas possessing intrinsical explosive properties is employed instead of hydrogen. The present blowpipe is furnished wit i -means for counteracting the explosiveness of the mixture and for preventing an explosion spreading in the inlet-pipe for acetylene or any gas being capable oi being decomposed with explosion A under certain circumstances.

.too great a loss oi head of gas.

Astone, compressed asbestos, zc., inserted in the piping) the form of a block they are given a section very considerable with regards the thickness to be traversed by the gas. They are given the form of a thin plate, through which the gas will normally pass, or that oi the space comprised between two cones slightly separated one from the other,

or, as limit oi' the preceding case, of the annular space comprised between two cylinders, which is obtained by piercing a full cylinder' following its axis.

The loss of head, sensibly proportionate to the thickness and tothe square of the speedthat is to say, to the inverse 'of the square of the section (surface of the plate, cone/,or cylinder) can be reduced to verylittle; but the searchi'or a slight loss ci head, if' constructional reasons do not allow the section (sun face of the plate, cone, or cylinder) to be in 2creased, necessarily leads to the use of thin material, so that there is necessity to think of the strength of the porous body to prevent it splitting, which would take all efficacy from it. in order to avoid this accident, the surface exposed to receive the shock of an explosion is covered with a strong jacket-for instance, with metal plate pierced with holes "such apparatuses, nearly tangentially or at very small angles the axis of the inlet-pipes and the axis of' the tube for the escape of the mixture itwill be necessary to make them communicate by openings made in a plane almost perpendicular to the axis of the tube containing the mixture. Furthermore, it will be advantageous to replace a single opening by several smaller ones.

An advantageous device consists in arranging the end of the inlet-tube for acetylene or similar gases concentrically round the outlet-tube for mixture, the wall being pierced with holes situated in a plane passing at right angles with the axis and which are convergent up the axis or not, according to whether it is desired to utilize for the mixture the contact of opposed gaseous streams or the eddying movement of the streams, guided more or less is a circular manner by the proximity of' the wall.

The annexed drawing shows a sectional view of a blowpipe of this description.

a indicates the inlet-tube for acetylene, l) inlet for oxygen, and c the exit-tube for the mixture. The inlet-tube a terminates in a chamber a', into which projects the end e of the body of the tube a2 for conducting acetylene into the mixture-chamber. The end c inside the chamber o is pierced with a great many holes and is inclosed in a thin cylinder d, of a porous material. The cylinderd constitutes the stop for the explosion. The end e ofthe tube serves as covering for its side exposed to the shock of an explosion. The tube a2 terminates in a chamber a3 concentric to the portionf of the outlettube c, in which the mixture is made. The acetylene empties into the tube f by the holes g normxal to the wal of the tube or slightly inclined upon that Wa l.

Having new fully described my invention,

IOO

vhat I claim, and desire to secure by Letters Patent, is

1. In a device ofthe class described, a gas chamber forming aportion of the gas-passage, a metallic outlet-pipe closed at the inner end extending into ,the gas-chamber having a perforated peripheral Wall, .and a sleeve of porous material itting tightly upon the end ofthe outlet-pipe within the casing so as to cover the peripheral periorations, substantially as shown and described.

2. In a device of the class described, a gaschamber forming a portion of the gas-passage, a metallic outlet-pipe closed at the inner end extending in'to the gas-chamber having a perforated peripheral wall, a sleeve of porous material fitting tightly upon the end of the outletpipe within .the casing so as to cover the peripheral perforations, andan annular chamber at the outer end of the outlet-tube surrounding a central passage open atboth ends and in communication therewith by way of openings through the `annular dividing wall, substantially as shown and described.

' 3. In a device of the class described, a gaschamber forming a portion of the gas-passage, a metallic outlet-pipe closed at the inner end extending into the gas-chamber having a p`er` forated peripheral wall, a sleeve of porous santas material fitting tightly 'upon the end of the outlet-pipe within the casing so as to cover the peripheral perforations, the axis of the inlet, the outlet-tube and that of the inletorifice ofthe gas-chamber being substantiallv coincident, substantiallyas shown and de scribed.

4. In a device of vthe class described, a gaschamber forming a portion of the gas-passage, a metallic outlet-pipe closed at the inner end extending into the gas-chamber having a perforated peripheral wall, a sleeve of porous material fitting tightly upon the end of the outlet-pipe within the casing so as to cover the peripheral perforations, the axis of' the inlet, the outlet-tube and that oi the inletorifice of the gaschamber being substantially coincident, and an annular chamber at the outer end of the outlet-tube surrounding a central passage open at both ends and in communication therewith by way of openings through the annular dividing-wall, substantially as shown and described.

In testimony whereof I have hereunto set my hand in presence of two witnesses.

CHARLES PICARD.

Witnesses:

ADoLrH STU'RM, HansonV C. Co'xn. 

